The profit motive speaks for itself.
Talk radio is dominated by conservatives. There are respected newspapers and magazines which are conservative. If your point is that conservative voices are drowned by the overwhelming blare of liberals, you're wrong.
If you're point is that many liberals cannot be reached, you're right. You can lead a horse to water... You can fool all of the people some of the time and some of the people all the time....
The last time I looked most people grow up with their politics and their religion and die with them. It takes exceptional circumstances and exceptional people to change that. Fortunately, there are enough of them.
Radio and Magazines are easier for a small company or firm to make a profit out of. While Newspapers have a hard time producing a profit, and Television news needs the far reaching network across the world to keep up with the minute to minute news stories the other stations have.
Hence, Newspapers and Television media are owned exclusivly by large conglomerates. They tend to be more liberal and drown out conservative voices. Maybe keeping a few RINOs as their token conservatives.
While Radio and Magazines tend to be more conservative since it is easier for small companies to produce a profit.
Think about it, take Fox News out of the equation and who is there left? Novak? Keyes is gone.
Take out the Wall Street Journal and Washingtion Times and who is left? Nobody.